General Chemistry Answers

Write the oxidation half-reaction and reduction half-reaction, and shorthand electrochemical notation for the following.

1. Mg+H^+ -> Mg^ 2+ +H 2

2. KI + Cl2 -> KCl + I2

3. Cr^ + +Sn^ 4+ Cr^ 3+ +Sn^ 2+

4. 3 Hg^ 2+ +2 Fe (s) 3 Hg 2 +2 Fe^ 3+

5. 2 As (n) + 3 Cl₂ (g) → 2 AsCla

6. NaBr + Cl₂ ⇒ NaCl + Br₂

7. F*e_{2}*O_{3} + CO -> Fe + C*O_{2}

8. CO + I_{2}*O_{5} -> C*O_{2} + I_{2}

2 Fe^ 3+ (aq) +Sn^ 2+ 2 Fe^ 2+ +Sn^ 4+ (aq)

10. Chlorine gas oxidises Fe2+ ions to Fe³+ ions. In the process, chlorine is reduced to chloride ions.

The following practice problems are prepared for you to polish and enrich your understanding in determining the oxidizing state of elements and further widen your understanding about the differences between an oxidizing agent and a reducing agent.

Assign oxidation state to the underlined element.

1) Cl₂

2) SO₂

3) K₂0₂

4) Cr₂07-²

5) Na₂O₂

6) Na₂S₂O3

7) NaN3

8) CH4

9) Fe₂O3

10) MnO₂

Why is the mass of the vinegar sample measures instead of its volume?

3.The heat of fusion of water is 6.01 kl/mol.The heat capacity of liquid water is 75.3 J/mol-K.The conversion of 50.0g of ice at 0.00°C to liquid water at 22.0°C requires _______ kj of heat.

A work of 657 J is done on a system that releases 434 J of heat. What is the energy change in the system?

An unknown fluid, of mass 0.952 is ignited in a 4-liter bomb calorimeter. Both the liquid inside the calorimeter and the calorimeter itself increased in temperature by 3.914K. Previously, the same calorimeter was calibrated using 1.951 grams of benzoic acid and both the water and the calorimeter increased in temperature by 8.209K. Assume that the density of the water inside the calorimeter is not temperature-dependent. Heat of combustion for benzoic acid is 3226kJ per gram.

a.Find the heat of combustion of the fluid.

b.Which compound releases more heat, the unknown fluid or benzoic acid?

Arrange the following species in order of (a) increasing ionic radius, and (b) increasing ionization energy: O2-, F-, Na+, Mg2+. Explain your answer in terms of nuclear charge and charge of ions.

Butanol is composed of carbon, hydrogen, and oxygen. If 1.0 mol of butanol contains 6.0 x 1024 atoms of hydrogen, what is the subscript for the hydrogen atom in C4Hx Санхор

At 2.50 g of SF6 is introduced into an evacuated 5-L container at 83 ºC, what pressure in atmospheres is developed?

The equilibrium constant, K_c, for the following reaction is 1.31×10^-2 at 700 K.

NH₄I(s) NH₃(g) + HI(g)

Calculate K_c at this temperature for the following reaction:

NH₃(g) + HI(g) NH₄I(s)

K_c =